The France born Senegalese forward spent last season on loan at Juve Stabia in Serie B making 20 appearances, scoring six goals in the process.
Doukara, who can also operate as a winger, has experience in Italy’s top league with his parent club which came during the 2012/13 season.
The 22-year-old striker is United’s fourth new arrival of the summer and head coach David Hockaday said: “I’d like to welcome Souleymane to Leeds United.
“He is a big, powerful and fast player with a hunger to succeed. He is exactly what we need at the club.”
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